00934cam a22002771  4500001001300000003000400013005001700017008004100034010001700075035001900092040005400111045000900165050002200174051001600196082001100212100005600223245011000279260002200389300004000411490007600451500003900527504003700566650001300603650002300616999001700639gs 44000046 DLC20260227111350.0780808s1944    oruaf    b   s000 0 eng c  ags 44000046   a(OCoLC)4120272  aU. S. Geol. Survey. Libr.cNcRSdNcRSdOCoLCdDLC  ax4x400aQE155b.A3 no. 26  aQE571b.T85  a631.451 aTwenhofel, William H.q(William Henry),d1875-1957.10aSoil, the most valuable mineral resource,bits origin, destruction and preservation,cby W. H. Twenhofel.  a[Portland,c1944]  a45, [2] p.billus., plates.c28 cm.0 aOregon. State Dept. of Geology and Mineral Industries. Bulletinvno. 26  aReproduced from type-written copy.  a"References cited": p. [46]-[47] 0aErosion. 0aSoil conservation.  c27959d27959